WO2021112482A1

WO2021112482A1 - Pressure-resistant bellows and method for manufacturing same

Info

Publication number: WO2021112482A1
Application number: PCT/KR2020/016855
Authority: WO
Inventors: 김윤호; 김주환
Original assignee: 한국씰마스타주식회사
Priority date: 2019-12-03
Filing date: 2020-11-25
Publication date: 2021-06-10
Also published as: KR102119263B1

Abstract

The present invention provides a bellows and a method for manufacturing same, the bellows comprising: corrugated parts (110) and pressure resistance reinforcing supports (140). The corrugated parts (110) comprise multiple disk-shaped membranes (160), each of which has a perforated part (160b) formed at the center thereof and has a spherical wave-shaped curve formed around the perforated part (160b). The inner edge part (160c) of each of the disk-shaped membranes (160) is coupled/fixed to the inner edge part (160c) of another disk-shaped membrane (160) adjacent to the upper surface thereof, thereby forming perforated parts (160b), and the outer edge part (160d) of each of the disk-shaped membranes (160) is coupled/fixed to the outer edge part (160d) of another disk-shaped membrane (160) adjacent to the lower surface thereof, thereby forming continuous corrugations comprising troughs (120a, 120b) and crests (130). The pressure resistance reinforcing supports (140) have ring shapes and are inserted into the inner troughs (120a) or the outer troughs (120b) of the corrugated parts (110).

Description

Pressure-resistant bellows and manufacturing method thereof

The present invention relates to a pressure resistant bellows and a method for manufacturing the same.

Bellows are widely used in fields that require changes in stroke and volume in an environment where vacuum and pressure differences occur, and are equipment that absorbs vibrations or compensates for volume while maintaining sealing. Semiconductors, automobiles, It is widely used in various fields such as aerospace and nuclear power.

In particular, a vacuum technology that blocks movement of gas molecules due to pressure difference in a specific space of a chamber having a space of a pressure different from that of the external air, such as a vacuum space, and external air in an atmospheric state, and enables smooth operation of mechanical parts In addition to being widely used in the field, it is also widely used in the mechanical seal, which is an essential component of a rotating machine that includes a rotating shaft and requires fluid sealing.

As a specific example, the bellows is used as a mechanical seal part for pumps, compressors, turbines, and the like. The equipment listed above is a device for transporting, compressing, and expanding the fluid, and if the mechanical seal does not perform the sealing function properly, the economic loss such as deterioration of equipment performance, environmental pollution due to external leakage of the working fluid, and occurrence of safety accidents, etc. is enormous. Therefore, the mechanical seal must guarantee sealing performance during the design life and is a mechanical element that requires high reliability. For this, a bellows is used as one of the key parts.

According to the above use, the bellows must be manufactured so that physical properties such as durability and airtightness are satisfied, and particularly strong pressure resistance is required when used in an environment in which a pressure difference occurs.

However, as shown in FIG. 1, when a bellows with poor pressure resistance, such as a bellows having wrinkles formed by welding of thin plates, is used in an environment in which a pressure difference is large, the results shown in FIGS. 4 and 5 As such, the thin plate is deformed by the pressure difference and a problem of rupture of the weld is caused.

In particular, when used as a mechanical seal part, excessive deformation of the bellows due to pressure difference causes MED (Mean Effective Diameter) shift phenomenon. This means that the balance ratio, which is a major design element of the mechanical seal, changes according to the pressure, and it is a key reason that the bellows cannot be applied to the mechanical seal used in a high pressure environment.

Therefore, for the same reason as described above, the bellows is used only under a pressure condition of 20 Bar or less, and a spring as shown in FIG. 11 (a) is used under a pressure condition of more than 20 Bar.

However, in the case of using a spring, as shown in FIG. 11 (a), as the face wears, the dynamic gasket moves toward the face (a-1). In addition, according to this, a solid is generated as a normal leak in the shaft in front of the dynamic gasket, and the solid acts as a cause to stop the motion of the dynamic gasket (a-2), and the dynamic gasket hangs up (a-2). -up) causes a problem of accelerating leakage (a-3) by lowering the closing force.

As shown in Fig. 11 (b), when using a bellows, there is no dynamic gasket, so gasket movement does not occur due to face wear (b-1), and solids are accumulated on the shaft due to normal leakage. Since hang-up does not occur (b-2), the problem in the case of using the spring as described above can be solved.

However, as described above, since the bellows developed in the prior art cannot be used at a pressure of more than 20 Bar, the development of a bellows that can be used at a high pressure is urgently required.

[Prior art literature]

[Patent Literature]

(Patent Document 1) Republic of Korea Patent Publication No. 10-2017-0095267

The present invention has been devised to solve the above problems of the prior art,

To provide a bellows that has sufficient withstand pressure characteristics even when used in a high-pressure environment where a large pressure difference occurs, and has a support for pressure-reinforcement while providing smooth axial compression and tensile motions that can satisfy both elastic and pressure-resistant properties at the same time. aim to

Another object of the present invention is to provide a creative manufacturing method that enables manufacturing of the bellows.

In order to achieve the above object, the present invention

As a bellows comprising a wrinkle part 110 and a support body 140 for pressure-reinforcement,

The wrinkle portion 110 includes a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave-shaped curve formed around the perforated portion 160b, and the disk-shaped membrane ( The other disk-shaped membrane 160 adjacent to the upper surface and the inner edge portion 160c forming the perforation portion 160b are coupled and fixed to each other, and the other disk-shaped membrane 160 adjacent to the lower surface and the outer edge portion 160d ) are coupled and fixed to each other to have a structure in which a continuous wrinkle is formed consisting of the

valleys

120a and 120b and the mountains 130;

The internal pressure reinforcement support 140 has a ring shape, and provides a bellows, characterized in that it is inserted into the inner bone (120a) or the outer bone (120b) of the wrinkle portion (110).

Also, the present invention

(a) manufacturing a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave-shaped curve formed around the perforated portion 160b;

(b) coupling and fixing the disk-shaped membranes 160 to the other disk-shaped membrane 160 adjacent to the upper surface and the inner edge portion 160c forming the perforation portion 160b, and another disk-shaped membrane adjacent to the lower surface (160) and the outer edge portion (160d) by coupling and fixing, manufacturing a wrinkled portion 110 in which continuous wrinkles are formed consisting of valleys (120a, 120b) and mountains (130) of a certain width;

(c) narrowing the width of the valleys (120a, 120b) and the mountain (130) by applying longitudinal pressure to the wrinkle portion (110);

(d) filling the inner bone (120a) of the wrinkle part (110) with a composition for forming a pressure-reinforcing supporter (140);

(e) curing the composition of the support 140 for strengthening the pressure resistance of step (d); and

(f) after the curing of step (e) is completed, it relates to a method of manufacturing a bellows comprising the step of releasing the pressure applied to the wrinkle portion (110).

Also, the present invention

(c) filling the inner bone (120a) or the outer bone (120b) of the wrinkle part (110) with a composition for forming a pressure-reinforcing supporter (140);

(d) narrowing the width of the valleys (120a, 120b) and the mountain (130) by applying longitudinal pressure to the wrinkle part (110) into which the pressure-reinforcing support (140) composition is injected;

(f) after the curing of step (e) is completed, releasing the pressure applied to the wrinkle portion 110; provides a method of manufacturing a bellows comprising a.

Since the bellows of the present invention has sufficient withstand pressure characteristics even when used in a high-pressure environment in which a pressure difference is large, it provides the effect of remarkably improving the reliability and durability of the bellows.

In addition, the bellows of the present invention forms a continuous spaced space of a certain size with the adjacent disk-shaped membranes in which the support for pressure-reinforcement forms an inner or outer bone, thereby providing a support for pressure-reinforcement in the axial direction. It provides the effect of simultaneously satisfying the elastic properties and the pressure-resistance properties due to smooth compression and tensile movements.

In addition, the method for manufacturing the bellows of the present invention provides a creative and efficient manufacturing method that enables the manufacturing of the bellows.

1 is a photograph taken in the form of a general bellows,

Figure 2 is a cross-sectional perspective view showing the form of a conventional bellows,

3 is a view showing an example of a mechanical seal (Mechanical seal) by a conventional bellows,

4 and 5 are diagrams showing an example of use in a state where the pressure difference between the inside and outside of the bellows is large as an example of a mechanical seal by a conventional bellows,

6 is a cross-sectional view showing one form of the bellows of the present invention in which a support for pressure-reinforcement is inserted into the inner bone,

7 is a cross-sectional view and a plan view showing the form and combination of the thin metal plate constituting the corrugation of the present invention bellows,

8 is a cross-sectional view showing in detail the structure of a bone portion formed of a spherical wave-shaped bent portion of the bellows of the present invention and a support for pressure-reinforcement inserted therein;

9 is a perspective view illustrating the same form as the cross-sectional view of FIG. 6 .

10 is a view showing an example of a mechanical seal (Mechanical seal) by the present invention bellows.

11 is a view illustrating an example of a mechanical seal by a spring and a mechanical seal by a bellows.

12 is a diagram illustrating an example of an apparatus for measuring MED and MED Shift (change amount) of a bellows.

13 is a graph showing the MED and MED Shift (change amount) of the bellows measured in the test example of the present invention.

14 is a cross-sectional view showing one form of the bellows of the present invention in which the internal pressure reinforcement support is inserted into the outer bone.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to describing the present invention, if it is determined that a detailed description of related known functions and configurations may unnecessarily obscure the gist of the present invention, a description thereof will be omitted.

The description and drawings below illustrate specific embodiments to enable those skilled in the art to readily practice the described apparatus and method. Other embodiments may include other structural and logical modifications. Individual components and functions may generally be selected unless expressly required, and the order of the process may vary. Portions and features of some embodiments may be included in or substituted for other embodiments.

1 is a photograph taken in the form of a general bellows. As shown in Fig. 1, the bellows compensates for the axial and radial movement of the equipment and performs a sealing function.

2 is a cross-sectional perspective view showing the shape of a conventional bellows, as shown in FIG. 2, the bellows is a corrugation 11 and upper and lower flanges 15 including a valley 12 and a mountain 13. ) is included.

3 shows an example of a mechanical seal by a conventional bellows, and FIGS. 4 and 5 are an example of a mechanical seal by a conventional bellows, in a state where the pressure difference between the inside and outside of the bellows is large Examples of use in

When a mechanical seal using a conventional bellows is used in an environment where the pressure difference between the inside and outside of the bellows is very large, deformation of the thin plate occurs as shown in FIG. 4, and as shown in FIG. 5, the pressure difference There is a problem in that the weld cannot be won and the weld is destroyed. When such a problem occurs, it is necessary to stop using the device and replace the bellows, which causes a very large loss of productivity.

The present inventors made diligent efforts to solve the above problems, and as a result, the bellows of an advanced form as shown in FIGS. 6 to 9 was completed.

Fig. 6 is a cross-sectional view showing one embodiment of the bellows of the present invention; 7 is a cross-sectional view and a plan view showing the form and coupling form of the thin metal plate 160 constituting the pleats 110 of the present invention bellows; 8 is a cross-sectional view showing in detail the structure of the bone portion formed of a spherical wave-shaped bent portion of the present invention bellows and the pressure-reinforcing support body 140 inserted therein; 9 is a perspective view illustrating the same form as the cross-sectional view of FIG. 6 .

As shown in Figures 6 and 7, the present invention is a bellows 100 including a wrinkle portion 110 and a support body 140 for pressure resistance reinforcement,

The wrinkle portion 110 includes a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave-shaped curved portion 160a formed around the perforated portion 160b, and the circle The plate-shaped membranes 160 are fixed to each other by coupling and fixing the other disk-shaped membrane 160 adjacent to the upper surface and the inner edge portion 160c forming the perforation portion 160b, and the other disk-shaped membrane 160 adjacent to the lower surface and the outer edge. It has a structure in which the parts (160d) are coupled to each other to form a continuous wrinkle composed of the valleys (120a, 120b) and the mountain (130);

The internal pressure reinforcement support 140 has a ring shape, relates to the bellows 100, characterized in that inserted into the inner bone (120a) or the outer bone (120b) of the wrinkle portion (110).

Since the bellows of the present invention includes the support body 140 for reinforcing internal pressure, the bellows does not break even when used in a space where a very high pressure difference exists, and due to the shape of the wrinkle part 110 having a special structure Even if the pressure-reinforcing support 140 is inserted, the axial compression and tensile movements are smooth.

In one embodiment of the present invention, the bellows is, as shown in FIG. 8 , the width (x) in the direction from the side where the inner bone 120a or the outer bone 120b of the wrinkle part 110 is blocked. ) has a structure that gradually increases, and the internal pressure reinforcement support 140 inserted therein also has a thickness (y) that is gradually increased according to the shape of the bone,

The width (x) of the valley and the thickness (y) of the support for pressure-reinforcement 140 in 50% or more of the entire section in which the pressure-reinforcing support 140 is provided is 1: 0.3 to 0.9 based on the same point. It may have a characteristic that satisfies the rain.

When the width (x) of the inner bone (120a) or the outer bone (120b) of the wrinkle part 110 and the thickness (y) of the internal pressure reinforcement support 140 inserted therein satisfy the above conditions, While having the pressure-reinforcing support 140 , the axial compression and tensile motions are smooth to satisfy the elastic properties and the pressure-resisting properties at the same time, so it can be usefully used in various industrial fields.

That is, as shown in Figure 8, the internal pressure reinforcement support 140 and the disk-shaped membranes 160 forming the inner bone (120a) or the outer bone (120b) and a continuous spaced space of a certain size ( 170), the axial compression and tensile motions are smooth, and it is possible to simultaneously satisfy the elastic properties and the withstand pressure properties.

The width (x) of the valley and the thickness (y) of the pressure-reinforcing support 140 are 1: 0.3 to 0.9 based on the same point in 50% or more of the entire section in which the pressure-reinforcing support 140 is provided. It is desirable to satisfy the ratio, when the ratio of the thickness (y) of the pressure-reinforcing support 140 is less than 0.3, the alphabet “V”-shaped valley formed by the disk-shaped membrane 160 is formed by the high pressure. It is deformed into a “U”-like shape, and it is difficult to suppress destruction in the end, and when it exceeds 0.9, the space between the disk-shaped membrane 160 and the pressure-reinforcing support 140 is insufficient, so that the axial compression It is not preferable because it is difficult to secure the elasticity.

In addition, if the above condition is satisfied only in less than 50% of the entire section in which the support for pressure-reinforcement 140 is provided, it is not preferable because it is difficult to expect the same effect.

With respect to the continuous spaced space 170 of a certain size formed by the disk-shaped membranes 160 forming the internal pressure-reinforcing support 140 and the inner bone 120a or the outer bone 120b, the inner pressure More excellent effect if the width of the valley and the thickness of the support 140 for pressure reinforcement in 80% or more of the entire section in which the reinforcement support 140 is provided meets a ratio of 1: 0.5 to 0.9 based on the same point can be expected

Furthermore, the width of the valley and the thickness of the support 140 for pressure-reinforcement in 80% or more of the entire section in which the pressure-reinforcing supporter 140 is provided, based on the same point, meets a ratio of 1:0.7 to 0.8. If you do, you can expect even better effects.

In one embodiment of the present invention, the pressure-reinforcing support 140 is an inner edge portion 160c and an inner edge portion 160c of the disk-shaped membrane 160 at the entrance side of the inner valley 120a of the wrinkle portion 110 . ) from the end of the fixed part or from the contact point where the inner edge part 160c meets each other to the blocked part, or

Inserted integrally from the end of the fixing part of the outer edge portion 160d and the outer edge portion 160d of the disk-shaped membrane 160 on the inlet side of the outer bone 120b or from the contact point where the outer edge portions 160d meet to the blocked portion. can be

Since the support 140 for reinforcing the pressure resistance having the above structure uniformly supports the front surface of the disk-shaped membrane 160 when a strong axial compressive force is applied, the disk-shaped membrane 160 is formed by strong axial pressure. can be effectively prevented from being deformed or destroyed.

In an embodiment of the present invention, the upper surface and/or the lower surface of the pressure-reinforcing support 140 is spaced apart from the adjacent disk-shaped membrane 160 surface, and the distance is 50% or more in the longitudinal central axis direction of the bellows. It may be formed continuously in a section, more preferably 80% or more, still more preferably 90% or more, and most preferably 95% or more. In this way, the separation space 170 must be provided to effectively prevent deformation or destruction of the shape of the disk-shaped membrane 160 when a strong axial compressive force is applied, and it is also preferable to secure the elastic force of compression and extension of the bellows. Do.

In one embodiment of the present invention, the spherical wave-shaped curvature of the disk-shaped membrane 160 may include 1 to 5 pairs of valleys 160e and peaks 160f. However, it is not limited to this range, and may include 5 or more pairs of valleys and mountains.

By forming the spherical wave-shaped bend as described above, the pressure-reinforcing support body 140 is suppressed from falling out, and the compression and extensibility are excellent, and the spring constant of the bellows is reduced. In addition, in the process of manufacturing the thin metal plate (membrane 160), distortion or waveness deformation in the circumferential direction occurs during the manufacture of the bellows, which ultimately reduces the pitch of the bellows (the distance between the mountains: the distance between the welds) unevenness. It adversely affects the bellows performance. By applying the spherical wave shape to the disk-shaped membrane 160 , it is possible to obtain an effect of mitigating the deformation of the membrane 160 in the circumferential direction.

In one embodiment of the present invention, the internal pressure-reinforcing support 140 is preferably provided in the entire inner bone 120a or the outer bone 120b of the wrinkle portion 110 . If, in any one of the inner bone (120a) or the outer bone (120b) there is a portion that does not contain the internal pressure reinforcement support 140, the pressure is concentrated in that portion to deform or destroy the shape of the bellows. This is not preferable because it can occur.

In one embodiment of the present invention, the disk-shaped membrane 160 may be a thin metal plate having a thickness of 0.01 to 2 mm, but is not limited thereto. As the thin metal plate, those known in the art may be used without limitation.

In one embodiment of the present invention, the coupling and fixing of the inner edge portion 160c and the outer edge portion 160d of the disk-shaped membrane 160 may be performed by a method used in this field, and typically fixed by a welding method. have.

Figure 10 shows an example of a mechanical seal (Mechanical seal) by the present invention bellows. As illustrated in FIG. 10 , in the bellows of the present invention, when the pressure difference between the inside and the outside of the bellows is large, the support 140 for strengthening the internal pressure is provided in the valley 120a of the low pressure space. The case of FIG. 10 shows a case where the pressure inside the bellows 100 is small. In this case, unlike the conventional bellows shown in FIG. 5, the pressure-reinforcing support ( 140), so that excessive deformation of the thin plate and rupture of the fixing part are effectively prevented.

Bellows 100 of the present invention may have a pressure resistance characteristic for a pressure of more than 20 Bar, specifically, it may have a pressure resistance characteristic for a pressure of more than 20 Bar ~ 1,000 Bar, preferably 30 ~ 1,000 Bar, More preferably, it may have pressure resistance against a pressure of 50 to 1,000 Bar. The upper limit of the pressure may be limited to 1,00 Bar, 300 Bar, or 500 Bar.

In addition, it is natural that the bellows of the present invention can be used in a space where there is no pressure difference or a space where the pressure difference is less than 100 Bar.

The pressure-reinforcing support 140 may have a feature of being formed of an elastic body, and the elongation of the elastic body may be 30 to 1,000%. Specifically, when the hardness is 3 to 95 Shore A, it may have a characteristic of 30 to 510%, and when the hardness is 45 to 85 Shore D, it may have a characteristic of 100 to 450%.

If the hardness of the pressure-reinforcing support 140 is too high, it may cause damage to the thin plate of the bellows 100, and if the hardness is too low, the pressure resistance characteristics are deteriorated. Therefore, those having appropriate hardness and elasticity can be preferably used.

The pressure-reinforcing support 140 may be made of, for example, FKM, FFKM, EPDM, NBR, silicone rubber, PTFE, or the like.

In the bellows 100 of the present invention, the shape of the flange 150 coupled to both ends of the wrinkle part 110 is not particularly limited, and a flange of an appropriate shape according to the purpose and use form of the bellows 100 . 150 may be mounted.

In the bellows 100 of the present invention, for the configuration not particularly limited in the above, the configuration of a conventional bellows in this field may be employed without limitation.

Also, the present invention

(a) manufacturing a plurality of disk-shaped membranes 160 in which a perforated portion 160b is formed in the center and a spherical wave-shaped curve 160a is formed around the perforated portion 160b;

In step (d), while filling the composition for forming the pressure-reinforcing support 140, or after filling the composition for forming the pressure-reinforcing support 140, the bellows is rotated based on the central axis of the perforated portion 160b. The process may be further performed. When the bellows is rotated in this way, it is preferable that the filled composition for forming the internal pressure strengthening support 140 can be uniformly filled into the bone by centrifugal force.

In addition, after the composition for forming the pressure-reinforcing support 140 is filled in step (d), if the composition for forming the pressure-reinforcing support 140 is possible by this state, the longitudinal pressure is released, It is also possible to perform a curing process.

Also, the present invention

(f) after the curing of step (e) is completed, releasing the pressure applied to the wrinkle portion 110; relates to a method of manufacturing a bellows comprising a.

In the step (c), while filling the composition for forming the pressure-reinforcing support 140, or after filling the composition for forming the pressure-reinforcing support 140, the bellows is rotated based on the central axis of the perforated portion 160b. The process may be further performed. When the bellows is rotated in this way, it is preferable that the filled composition for forming the internal pressure strengthening support 140 can be uniformly filled into the bone by centrifugal force.

In addition, when the composition for forming the pressure-reinforcing support 140 is possible by step (d), it is also possible to perform the curing process after releasing the longitudinal pressure.

The content regarding the bellows described above can be equally applied to the method for manufacturing the bellows of the present invention. Therefore, redundant content is omitted below.

In one embodiment of the present invention, the manufacturing method is before filling the composition for forming the support 140 for pressure-reinforcement in the inner bone 120a or the outer bone 120b of the wrinkle part 110 in the step (c). It may further include the step of applying a release agent to the inner bone (120a) or the outer bone (120b) of the wrinkle portion (110). The release agent may be used without limitation a component known in the art, for example, silicone resin, paraffin, wax, etc. may be used, but is not limited thereto.

In one embodiment of the present invention, the pressure-reinforcing support 140 composition may include a polymer resin, a curing agent, and a solvent. The pressure-reinforcing support 140 composition may include 40 to 80% by weight of a polymer resin, 1 to 10% by weight of a curing agent, and 10 to 50% by weight of a solvent based on the total weight of the composition.

In particular, the pressure-reinforcing support 140 composition may preferably have a viscosity of 10 to 300 Pa.s, and more preferably 100 to 200 Pa.s. When the viscosity is less than 10 Pa.s, it is difficult to inject the composition into the inner bone 120a or the outer bone 120b because the flowability of the composition is too large, and when it exceeds 300 Pa.s, the composition is applied to the inner bone 120a ) or because it is difficult to inject into the outer bone (120b), it is not preferable.

In one embodiment of the present invention, the polymer resin may be one or more selected from the group consisting of FKM (Fluoro Elastomer), silicone, and the like, but is not limited thereto.

The curing may be accomplished by thermal curing or photocuring, and as the curing agent, a component known in the art may be used.

Hereinafter, preferred examples are presented to aid the understanding of the present invention, but the following examples are merely illustrative of the present invention, and it will be apparent to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention, It goes without saying that such changes and modifications fall within the scope of the appended claims.

제조예 1: 내압강화용 지지체 조성물의 제조Preparation Example 1: Preparation of a support composition for reinforcing pressure resistance

Denkist's CharmFlex Series and ShinEtsu's RTV rubber (Silicon) compositions were used as support compositions for pressure-reinforcement.

시험예: MED(Mean Effective Diameter) Shift 평가Test Example: MED (Mean Effective Diameter) Shift Evaluation

MED (Mean Effective Diameter) Shift was evaluated for the bellows manufactured according to the present invention and the bellows manufactured according to Korean Patent No. 10-1933176 as follows.

(1) 시험방법 (1) Test method

12 is a test equipment for measuring the MED of the bellows. The test equipment consists of a pressure vessel, a shaft assembly, a load cell, an upper support plate, and a lower support plate. 12, the bellows is mounted on the shaft assembly. At this time, use appropriate packing for sealing between the bellows and the pressure vessel and between the bellows and the shaft assembly. Before the pressure is applied inside the pressure vessel, the shaft assembly falls down by its own weight. To prevent this, a nut is assembled in the middle of the shaft assembly and hung on the top of the pressure vessel to support the load of the shaft assembly. Then, when the pressure inside the pressure vessel is applied, a force is generated in the upper direction of the shaft assembly for the area along the pressure boundary surface (MED) of the bellows, and this force is transmitted to the load cell and measured and recorded in real time. Through the relational expressions of pressure, area of action, and force, the area of action of pressure is obtained, and MED is calculated based on this. At this point, it should be the sum of the spring force (F _S) generated by the weight (w) and the assembled bellows of the shaft assembly of the load cell to the load (F _L) value.

As shown in the above formula, the MED of the bellows can be calculated by measuring the pressure applied to the bellows and the load acting on the load cell at that time.

The product used in the test of this bellows is a bellows product designed with MED 75mm, and the product to which the technology of Patent No. 10-1933176 is applied was used as a control group to confirm the performance difference between the products.

(2) 시험결과(2) Test results

As a result of conducting the MED test, as shown in FIG. 13 , the MED shift (change amount) of the product of the present invention started to occur at a pressure of 40 bar or higher and was 0.7 mm at 100 bar, and in the case of a product to which the existing patent was applied, the same pressure Under the condition, about twice as much MED Shift compared to the product of the present invention occurred. Through this test, it was confirmed that the technology of the present invention significantly improved the MED shift suppression ability compared to the existing technology.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the appended claims are intended to cover such modifications and variations as fall within the scope of the present invention.

[Explanation of code]

10: normal bellows 11: pleated part

12: Col 13: Mountain

15: flange 100: bellows of the present invention

110: wrinkle portion 120a: inner bone

120b: lateral bone 130: acid

140: support for pressure reinforcement 150: flange

160: disk-shaped membrane 160a: spherical wave part

160b: perforated portion 160c: inner edge portion

160d: outer edge 160e: bone of the disk-shaped membrane

160f: mountain of disc-shaped membrane 170: separation space

Claims

As a bellows comprising a wrinkle part 110 and a support body 140 for pressure-reinforcement,

The wrinkle portion 110 includes a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave-shaped curve formed around the perforated portion 160b, and the disk-shaped membrane ( The other disk-shaped membrane 160 adjacent to the upper surface and the inner edge portion 160c forming the perforation portion 160b are coupled and fixed to each other, and the other disk-shaped membrane 160 adjacent to the lower surface and the outer edge portion 160d ) are coupled and fixed to each other to have a structure in which a continuous wrinkle is formed consisting of the valleys 120a and 120b and the mountains 130;

The internal pressure reinforcement support 140 has a ring shape, and is inserted into the inner bone 120a or the outer bone 120b of the wrinkle part 110,

The inner bone 120a or the outer bone 120b of the wrinkle part 110 has a structure in which the width is gradually increased in the direction from the blocked side toward the entrance,

The internal pressure-reinforcing support 140 inserted therein also has a thickness that gradually increases according to the shape of the bone,

The width of the valleys 120a and 120b and the thickness of the pressure-reinforcing support 140 in 80% or more of the entire section in which the pressure-reinforcing support 140 is provided is 1: 0.5 to 0.9 based on the same point. meets,

Bellows, characterized in that a separation space is formed between the membrane 160 and the pressure-reinforcing support 140 according to the difference between the width of the valleys (120a, 120b) and the thickness of the pressure-reinforcing support (140).
According to claim 1,

The width of the troughs 120a and 120b and the thickness of the support 140 for pressure-reinforcement in 80% or more of the entire section in which the pressure-reinforcing support 140 is provided is 1: 0.7 to 0.8 based on the same point. Bellows, characterized in that it meets.
According to claim 1,

The pressure-reinforcing support 140 is from the end of the fixed portion of the inner edge portion 160c and the inner edge portion 160c of the disk-shaped membrane 160 at the inlet side of the inner bone 120a of the wrinkle portion 110 or The inner edge portion 160c is integrally inserted from the contact point to the blocked part, or

Inserted integrally from the end of the fixing part of the outer edge portion 160d and the outer edge portion 160d of the disc-shaped membrane 160 at the inlet side of the outer bone 120b or from the contact point where the outer edge portions 160d meet to the blocked portion. Bellows characterized in that it becomes.
4. The method of claim 3,

The upper and lower surfaces of the pressure-reinforcing support 140 are spaced apart from the adjacent disk-shaped membrane 160, and the distance is continuously formed in a section of 50% or more in the longitudinal central axis direction of the bellows, characterized in that Bellows.
5. The method of claim 4,

The upper and lower surfaces of the pressure-reinforcing support 140 are spaced apart from the adjacent disk-shaped membrane 160, and the distance is continuously formed in a section of 80% or more in the longitudinal central axis direction of the bellows, characterized in that Bellows.
According to claim 1,

Bellows, characterized in that the spherical wave-shaped curvature of the disk-shaped membrane 160 includes a pair of 1 to 5 valleys (160e) and mountains (160f).
According to claim 1,

The pressure-reinforcing support 140 is bellows, characterized in that provided in the entire inner bone (120a) or the outer bone (120b) of the wrinkle portion (110).
8. The method of claim 7,

The bellows is a bellows, characterized in that it has a pressure resistance against a pressure of more than 20 Bar ~ 1,000 Bar.
According to claim 1,

The pressure-reinforcing support body 140 is a bellows, characterized in that formed of an elastic body.
10. The method of claim 9,

Bellows, characterized in that the elongation of the elastic body is 30 ~ 1,000%.
(a) manufacturing a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave-shaped curve formed around the perforated portion 160b;

(b) coupling and fixing the disk-shaped membranes 160 to the other disk-shaped membrane 160 adjacent to the upper surface and the inner edge portion 160c forming the perforation portion 160b, and another disk-shaped membrane adjacent to the lower surface (160) and the outer edge portion (160d) by coupling and fixing, manufacturing a wrinkled portion 110 in which continuous wrinkles are formed consisting of valleys (120a, 120b) and mountains (130) of a certain width;

(c) narrowing the width of the valleys (120a, 120b) and the mountain (130) by applying longitudinal pressure to the wrinkle portion (110);

(d) filling the inner bone (120a) of the wrinkle part (110) with a composition for forming a pressure-reinforcing supporter (140);

(e) curing the composition of the support 140 for strengthening the pressure resistance of step (d); and

(f) after the curing of step (e) is completed, releasing the pressure applied to the wrinkle portion 110; Method of manufacturing a bellows comprising a.
(a) manufacturing a plurality of disk-shaped membranes 160 having a perforated portion 160b formed in the center and a spherical wave-shaped curve formed around the perforated portion 160b;

(b) coupling and fixing the disk-shaped membranes 160 to the other disk-shaped membrane 160 adjacent to the upper surface and the inner edge portion 160c forming the perforation portion 160b, and another disk-shaped membrane adjacent to the lower surface (160) and the outer edge portion (160d) by coupling and fixing, manufacturing a wrinkled portion 110 in which continuous wrinkles are formed consisting of valleys (120a, 120b) and mountains (130) of a certain width;

(c) filling the inner bone (120a) or the outer bone (120b) of the wrinkle part (110) with a composition for forming a pressure-reinforcing supporter (140);

(d) narrowing the width of the valleys (120a, 120b) and the mountain (130) by applying longitudinal pressure to the wrinkle part (110) into which the pressure-reinforcing support (140) composition is injected;

(e) curing the composition of the support 140 for strengthening the pressure resistance of step (d); and

(f) after the curing of step (e) is completed, releasing the pressure applied to the wrinkle portion 110; Method of manufacturing a bellows comprising a.
13. The method of claim 11 or 12,

The wrinkle part before filling the composition for forming the support 140 for pressure-reinforcement in the inner bone 120a or the outer bone 120b of the wrinkle part 110 in the step (d) of claim 13 and the step (c) of claim 14 (c). (110) The method of manufacturing a bellows, characterized in that it further comprises the step of applying a release agent to the inner bone (120a) or the outer bone (120b).
13. The method of claim 11 or 12,

The pressure-reinforcing support (140) composition is a method of manufacturing a bellows, characterized in that it comprises a polymer resin, a curing agent, and a solvent.
15. The method of claim 14,

The polymer resin is a method of manufacturing a bellows, characterized in that at least one selected from the group consisting of FKM (fluororubber) and silicone rubber.
15. The method of claim 14,

The curing agent is a method of manufacturing a bellows, characterized in that a thermosetting agent or a photocuring agent.